Spring JDBC更新数据

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以下示例将展示如何使用Spring jdbc执行更新数据库表的记录,这里演示如何更新student表中指定条件…

以下示例将展示如何使用Spring jdbc执行更新数据库表的记录,这里演示如何更新student表中指定条件的记录。

语法:

String updateQuery = "update Student set age = ? where id = ?";  jdbcTemplateObject.update(updateQuery, age, id);  

在上面语法中 –

  • updateQuery – 具有占位符的更新查询用来更新学生信息。
  • jdbcTemplateObjectStudentJDBCTemplate 对象将 Student 对象更新到数据库表中。

创建项目

要了解上面提到的Spring JDBC相关的概念,这里创建一个项目用来演示如何更新Student表中的数据记录。打开Eclipse IDE,并按照以下步骤创建一个名称为:UpdateQuery 的Spring应用程序项目。

步骤说明

  1. 参考第一个Spring JDBC项目来创建一个Maven项目 –
  2. 更新bean配置并运行应用程序。

完整的项目结构如下所示 –

Spring JDBC更新数据

文件 : pom.xml 的内容 –

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">      <modelVersion>4.0.0</modelVersion>      <groupId>com.yiibai</groupId>      <artifactId>ReadQuery</artifactId>      <version>0.0.1-SNAPSHOT</version>      <packaging>jar</packaging>      <url>http://maven.apache.org</url>      <dependencies>          <dependency>              <groupId>junit</groupId>              <artifactId>junit</artifactId>              <version>3.8.1</version>              <scope>test</scope>          </dependency>          <dependency>              <groupId>mysql</groupId>              <artifactId>mysql-connector-java</artifactId>              <version>5.1.40</version>          </dependency>          <dependency>              <groupId>org.springframework</groupId>              <artifactId>spring-jdbc</artifactId>              <version>4.1.0.RELEASE</version>          </dependency>          <dependency>              <groupId>org.springframework</groupId>              <artifactId>spring-context</artifactId>              <version>4.1.4.RELEASE</version>          </dependency>      </dependencies>  </project>  

以下是数据访问对象接口文件:StudentDAO.java的代码内容:

package com.yiibai;    import java.util.List;  import javax.sql.DataSource;    import java.util.List;  import javax.sql.DataSource;    public interface StudentDAO {      /**       * This is the method to be used to initialize database resources ie.       * connection.       */      public void setDataSource(DataSource ds);        /**       * This is the method to be used to update a record into the Student table.       */      public void update(Integer id, Integer age);        /**       * This is the method to be used to list down a record from the Student       * table corresponding to a passed student id.       */      public Student getStudent(Integer id);  }  

以下是文件:Student.java的代码内容:

package com.yiibai;    public class Student {      private Integer age;      private String name;      private Integer id;        public void setAge(Integer age) {          this.age = age;      }        public Integer getAge() {          return age;      }        public void setName(String name) {          this.name = name;      }        public String getName() {          return name;      }        public void setId(Integer id) {          this.id = id;      }        public Integer getId() {          return id;      }  }  

以下是文件:StudentMapper.java的代码内容:

package com.yiibai;    import java.sql.ResultSet;  import java.sql.SQLException;  import org.springframework.jdbc.core.RowMapper;    public class StudentMapper implements RowMapper<Student> {      public Student mapRow(ResultSet rs, int rowNum) throws SQLException {          Student student = new Student();          student.setId(rs.getInt("id"));          student.setName(rs.getString("name"));          student.setAge(rs.getInt("age"));          return student;      }  }  

以下是实现类文件:StudentJDBCTemplate.java,它实现了接口StudentDAO.java
以下是文件:StudentJDBCTemplate.java的代码内容:

package com.yiibai;    import java.util.List;  import javax.sql.DataSource;  import org.springframework.jdbc.core.JdbcTemplate;    import java.util.List;  import javax.sql.DataSource;  import org.springframework.jdbc.core.JdbcTemplate;    import java.util.List;  import javax.sql.DataSource;  import org.springframework.jdbc.core.JdbcTemplate;    public class StudentJDBCTemplate implements StudentDAO {      private DataSource dataSource;      private JdbcTemplate jdbcTemplateObject;        public void setDataSource(DataSource dataSource) {          this.dataSource = dataSource;          this.jdbcTemplateObject = new JdbcTemplate(dataSource);      }        public void update(Integer id, Integer age) {          String SQL = "update Student set age = ? where id = ?";          jdbcTemplateObject.update(SQL, age, id);          System.out.println("Updated Record with ID = " + id);          return;      }        public Student getStudent(Integer id) {          String SQL = "select * from Student where id = ?";          Student student = jdbcTemplateObject.queryForObject(SQL, new Object[] { id }, new StudentMapper());          return student;      }  }  

以下是程序执行入口文件:MainApp.java的代码内容:

package com.yiibai;    import java.util.List;    import org.springframework.context.ApplicationContext;  import org.springframework.context.support.ClassPathXmlApplicationContext;  import com.yiibai.StudentJDBCTemplate;    public class MainApp {      public static void main(String[] args) {          ApplicationContext context = new ClassPathXmlApplicationContext("application-beans.xml");            StudentJDBCTemplate studentJDBCTemplate = (StudentJDBCTemplate) context.getBean("studentJDBCTemplate");            System.out.println("----Updating Record with ID = 2 -----");          studentJDBCTemplate.update(2, 19);            System.out.println("----Listing Record with ID = 2 -----");          Student student = studentJDBCTemplate.getStudent(2);          System.out.print("ID : " + student.getId());          System.out.print(", Name : " + student.getName());          System.out.println(", Age : " + student.getAge());      }  }  

以下是Bean和数据库配置文件:application-beans.xml的代码内容:

<?xml version="1.0" encoding="UTF-8"?>  <beans xmlns="http://www.springframework.org/schema/beans"      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xsi:schemaLocation="http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">        <!-- Initialization for data source -->      <bean id="dataSource"          class="org.springframework.jdbc.datasource.DriverManagerDataSource">          <property name="driverClassName" value="com.mysql.jdbc.Driver" />          <property name="url" value="jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=true" />          <property name="username" value="root" />          <property name="password" value="123456" />      </bean>        <!-- Definition for studentJDBCTemplate bean -->      <bean id="studentJDBCTemplate" class="com.yiibai.StudentJDBCTemplate">          <property name="dataSource" ref="dataSource" />      </bean>    </beans>  

注意: application-beans.xml 文件的位置是:{workspace}/fistapp/src/main/java 目录,如果放置错了,程序可能会因为找不到此配置文件而出错。

完成创建源代码和bean和数据库连接信息的文件配置后,运行应用程序。这里先简单说明一下运行的步骤,在项目名称(UpdateQuery)上点击右键,在弹出的菜单中选择:【Run As】-> 【Maven test】

在运行测试成功后,应该会输出类似以下内容(含有 BUILD SUCCESS 的信息) 。
接下来,点击类文件:MainApp.java 选择【Run As】->【Java Application】,如果应用程序一切正常,这将打印以下消息:

----Updating Record with ID = 2 -----  Updated Record with ID = 2  ----Listing Record with ID = 2 -----  ID : 2, Name : Minsu, Age : 19  

  

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